Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 92)

DIU/DIM Details
7-12 Verilink
Figure 7-14 Data Flow for Drop-and-Insert Toward Network
Channels 19 to 24 are available for high-speed data transmission
over the network. These six channels are user-assigned to a data
port of a DIU 2130 connected to the CSU. The CSU inserts the high-
speed data onto channels 19 through 24 of the signal from the
equipment, and then sends the composite signal to the network.
Incoming from the network, the CSU drops the incoming composite
DS1 signal to the DIU 2130. The high-speed data on channels 19 to
24 is extracted by the DIU and routed to the customer data
equipment. The data on channels 1 through 18 of the incoming
network signal continues through the CSU to the DS1 equipment.
The CSU also sends all-ones on channels 19 to 24 toward the
equipment.
For through timing with drop-and-insert toward the network, the
receive DIU clock is derived from the incoming network signal and
applied to the DIUs via data bus A. (Figure 7-13.) The DIU transmit
clock and the CSU transmit clock to the network are similarly
derived from the incoming signal from the equipment. The
transmit and receive clocks are applied to the DIUs via Data Bus A.
NETWORK DATA EQUIPMENT DATA ALL ONES BYTES
TO EQUIPMENT
NCC or TAC
DROP-AND-INSERT DATA
TO/FROM NETWORK
1
18
19
24
19
24
19
24
1
18
19
24
NET EQPT